Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..70..329k&link_type=abstract
Astrophysics and Space Science, vol. 70, no. 2, July 1980, p. 329-362.
Astronomy and Astrophysics
Astrophysics
6
Astrophysics, Binary Stars, Radial Velocity, Stellar Motions, Coordinates, Eclipsing Binary Stars, Stellar Atmospheres
Scientific paper
A theory is presented of the radial-velocity changes of the component of close binary systems which emphasizes phenomena arising from finite dimensions of such components and their mutual distortion and irradiation. It is stressed that the deformability of fluid stars and gas motions in their atmospheres can give rise to systematic differences between the observed radial velocities of such stars and those of their mass centers. The coordinate systems employed to treat various aspects of the problem are introduced, and extraction of information from the radial-velocity component of absolute motions of the mass-centers of such stars is considered. Finally, the effects of distortion on radial velocity averaged over the entire visible disk of the respective star at different phases is evaluated, and this treatment is extended to stars undergoing eclipses.
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